Hi EagleKing,
I unfortunately don't know what is causing it... I'm fighting with a similar problem when I mirror a face I'm working on... somehow some extra faces is added... and somehow they drag in the original half of the face causing its getting a bit weird an extra dark in some places...
unfortunately I don't know the solution to the problem... but if nobody answers... I will return when I have figured it out...
hopefully someone knows the answer... 
regards
Strarup
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Alex V. U. Strarup
One mistake can ruin it all...